David bissell



(No Model.)

D. BISSELL. Bevel Square.

No. 228,027. Patented May 25,1880.

WITNESSES: fiymk-J' m'fbu:

BY ATTORNEYS.

Nmnz ns. PQTOUTHOGRAPHER, WASHINGTON. (1Q.-

UNITED STATES DAVID BIssnLL,

PATENT Orrrce.

OF DETROIT, MICHIGAN, ASSIGNOR TO HIMSELF AND JAMES A. FOSTER, OF SAMEPLACE.

BEVEL-SQUARE.

SPECIFICATION forming part of Letters Patent No. 228,027, dated May 25,1880.

Application filed March 24,1880. (No model.)

To all whom it may concern:

Be it known that I, DAVID BIssELL, of Detroit, in the county of Wayneand State of Michigan, have invented a new and Improved Bevel-Square, ofwhich the following is a specification. j

The object of this invention is to provide forthe use of machinists,carpenters, and others a bevel-square in which the head can be set atany required angle quickly and with certainty, which contains in thestock or handle a pocket for the reception of a combined marker andscrew-driver, and which possesses great strength and durability.

It consists of a graduated arm pivoted at one end to the end of thehandle opposite the head, by which, when thrown out of the pocket in thehandle, the head is set to the required angle, and, lastly, of a pocketin the handle for the reception of the, combined marker and set-screw,provided with a rubber cushion for holding the same in the pocket.

In the accompanying drawings, Figure 1 is a perspective view of mybevel-square. Fig. 2 a detail view of the screw-driver and. markerbelonging to the bevel-square. Fig. 3 is a longitudinal sectionalelevation of the bevel-square on the line as .00, Fig. 1. Fig. iis aninside view of the top plate of the bevelsquare. Fig. 5 is an insideview of the bottom plate of the bevel-square.

Referring to the drawings,A represents the handle or stock of theimplement. It is composed of two parts, a a, both provided with arecess, 1), on adjacent faces, so that when placed together and securedat the lower end by transverse rivets a slot is formed extending fromthe riveted end out through the opposite end. At the open end of thehandle a hole, 0, is made through the two partsof the handle,screw-threaded on one side and countersunk on the other.

B represents the bladeor head of the square with a slot made through itfor about half its length. This blade is placed in the slot in thehandle, with the slot therein between the two parts of the hole in thehandle, and the blade is secured to the handle by a set-screw, 01, madeof steel and having a chamfered head, so that it will sink into thecountersunk hole in the handle. By this arrangement the head or blade isheld in any desired position with relation to the edges of the handle,and, further,

the countersinking of the screw gives two smooth or even sides to thehandle, and thus enables one or the other to be used at pleasure.

0 represents the graded bar for the angle of the bevel. At its lowerfixed end it is pivoted to the handle nearone edge of the latter, sothat it will fold in the pocket 0, formed by a recess in the part 66' ofthe handle, extending from near the pivot of the arm or head through thefixed end of the handle, so that the graded bar folds in with its edgeflush with the edge of the handle. A stop,f, prevents it from going toofar in the pocket, while its end, projecting out of the handle beyondthe pivot, enables it to be thrown out readily from its pocket. Betweenthe graded bar and the other side of the handle there is sufficientspace for the blade B.

In the part a, at the lower end, is made a slot or pocket, f, extendingup into the handle, and having on one side, near the end, a cushion, g,of rubber or leather. In this pocket is placed the combined marker andscrew-driver D. The cushion, bearing upon it, holds ir in place,whilethe head, projecting out, enables it to be withdrawn easily. I jThe device is used as follows: The graded bar 0 is prevented by a stopfrom moving out farther than shown in the drawings. So when a bevel isto be set this bar is thrown out into the position it occupies in Fig.1, the set-screw is loosened to release the blade B, and this is thenturned until its lower edge coincides with the line on the graded barcorresponding to the required angle of the bevel. By means of theset-serew it is then secured in this position and the graded bar turnedinto its pocket, and the implement is ready for use in marking off thebevels, and this can be done by the tool D, which is adapted to serveeither as a marker or screw-driver.

Thus a compact bevel-square is furnished with which any angle can beobtained quickly and with perfect accuracy, as the grading on the bar Ocan be arranged toany scale, and so as to give a range of ninetydegrees, while the pockets for the grading-bar and marker D givecompactness to the implement, and the countersinking of the set-screwenables both 2. The pocket f, with cushion g, in the hansides of thehandle to be used. dle, for the reception of the combined marker Havingthus described my invention, I and screw driver D, substantially asdeclaim as new and desire to secure by Letters scribed.

5 Patent- 1. As an improvement in bevel-squares, the DAVID BISSELL.

graduated arm or bar for obtaining the angle for the head or blade,pivoted in the lower end Witnesses of the handle A and adapted to foldin the FRED A. BAKER,

1o pocket 0 in the handle, in combination with W. R. MONTGOMERY.

the head or blade B, substantially as described.

